English version: Cross wiki active person who uses the accounts and IP-addresse below for long time structural misuse of sockpuppets. Extensive files can be found here. It concerns edits on articles with more accounts to increase credibility and keeping them when nominated, promotion for the subject himself, Yuri Landman, his products (musical instruments like Moodswinger, Moonlander, Springtime and Quick Steps Kalimba), promotion for musical events, musical groups with whom the person has professional interests and dealings with. Influencing discussions and articles with more accounts, striving to keep articles created with more accounts and IP-addresses, concerning policy discussions as well as content like original musical research and promotion for himself and/or his products/activities. User has been addressed many times in the past, has promised over and over again to stop these unwanted activities but again and again restarted on wikipedia-nl and elsewhere. Creates a whole cross-wiki network of articles enhancing and promoting his own professional activities for his own personal benefit. All accounts and used IP-addresses have been blocked on wikipedia-nl after extensive repeated many checkusers and edit checking, some have been blocked as well on en-wiki and fr-wiki where similar problems were encountered and partly dealt with in a similar way. Creates sockpuppets and also uses old accounts and reactivates sleepers. IP-adresses are assigned by his ISP for shorter or longer periods of time. Most checkusered long time structural vandal on nl-wiki. Keep recreating articles on subjects he is involved with who were judged to be not encyclopedically relevant over and over again everywhere with new accounts. Also worked anonymously, gets semi-dynamic IP-adresses allocated from 1 week to 8 months each from his ISP Ziggo, location Veenendaal, most of the time from the ranges